A computer programmer's work involves writing CODE, which is a set of instructions that tell a computer what to do. CODE is written in a programming language, such as Java, C , or Python, and is used to create software applications, websites, and other digital products. Computer programmers must have a strong understanding of the language they are coding in, as well as an understanding of the problem they are trying to solve. They must also be able to debug their CODE, which means finding and fixing errors in the CODE.